feat: add dev.sh main framework header

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/dev.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+
+# Hot-Reload Dev Script for TopFans Backend
+# Usage: ./dev.sh
+#
+# Requires: fswatch (Mac: brew install fswatch) or inotifywait (Linux)
+
+set -e
+
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+CYAN='\033[0;36m'
+NC='\033[0m'
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+cd "$SCRIPT_DIR"
+
+# Detect platform
+if [[ "$(uname)" == "Darwin" ]]; then
+    WATCHER_TOOL="fswatch"
+    WATCHER_CMD="fswatch -r"
+elif [[ "$(uname)" == "Linux" ]]; then
+    WATCHER_TOOL="inotifywait"
+    WATCHER_CMD="inotifywait -r -m -e modify,create,write"
+else
+    echo -e "${RED}不支持的平台${NC}"
+    exit 1
+fi
+
+if ! command -v "$WATCHER_TOOL" &> /dev/null; then
+    echo -e "${RED}缺少工具: $WATCHER_TOOL${NC}"
+    if [[ "$(uname)" == "Darwin" ]]; then
+        echo "安装方法: brew install fswatch"
+    else
+        echo "安装方法: sudo apt install inotify-tools  (Debian/Ubuntu)"
+        echo "         sudo yum install inotify-tools    (CentOS/RHEL)"
+    fi
+    exit 1
+fi
+
+ENV_FILE="$SCRIPT_DIR/.env"
+if [ -f "$ENV_FILE" ]; then
+    echo -e "${GREEN}📄 加载 .env 文件...${NC}"
+    set -a
+    source "$ENV_FILE"
+    set +a
+fi
+
+DB_HOST="${DB_HOST:-localhost}"
+DB_PORT="${DB_PORT:-5432}"
+DB_USER="${DB_USER:-haihuizhu}"
+DB_PASSWORD="${DB_PASSWORD:-admin}"
+DB_NAME="${DB_NAME:-top-fans}"
+DB_ARGS=(-db-host="$DB_HOST" -db-port="$DB_PORT" -db-user="$DB_USER" -db-password="$DB_PASSWORD" -db-name="$DB_NAME")